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Table 1 Education level distribution and sickness absence risk in mid-pregnancy according to source of data: 49637 MoBa mothers

From: Information bias of social gradients in sickness absence: a comparison of self-report data in the Norwegian Mother and Child Cohort Study (MoBa) and data in national registries

Source of data and education level N % Sickness absence casesa Riska 95% CI
Register data    14,731 0.478 0.473 to 0.484
Education level (15 missing)
 Lower secondary or less 2431 5 689 0.634 0.605 to 0.663
 Upper secondary, basic 1638 3 559 0.630 0.598 to 0.661
 Upper secondary, complete 11,484 23 3506 0.539 0.527 to 0.551
 Tertiary, undergraduate 25,523 51 8024 0.484 0.476 to 0.492
 Tertiary, graduate 8546 17 1953 0.339 0.327 to 0.352
Self-report data    11,279 0.307 0.303 to 0.312
Education level (4207 missing)
 Lower secondary or less 835 2 149 0.336 0.292 to 0.380
 Upper secondary, basic 2076 5 455 0.337 0.312 to 0.362
 Upper secondary, complete 10,981 24 2758 0.340 0.330 to 0.351
 Tertiary, undergraduate 19,779 44 5268 0.318 0.310 to 0.325
 Tertiary, graduate 11,759 26 2649 0.260 0.251 to 0.268
  1. CI confidence interval
  2. aCases and risks restricted to 30,814 participants with register data and 36,684 participants with self-report data on both education and sickness absence; see Fig. 1